What should be checked first if sludge is decomposing in the primary clarifier?

When sludge is decomposing in the primary clarifier, it is essential to check the sludge collection mechanism first. The primary clarifier plays a critical role in the wastewater treatment process by allowing solids to settle out of the influent. If the sludge collection mechanism is not functioning properly, it may result in inadequate removal of settled sludge from the clarifier. This can lead to excessive buildup of organic matter, promoting anaerobic conditions which cause decomposition rather than proper stabilization of the sludge.

An ineffective sludge collection mechanism can result from mechanical failure, blockages, or operational issues. Ensuring that this mechanism operates effectively allows for proper maintenance of sludge levels and reduces the chances of further deterioration in water quality.

While other elements like the aeration system, chemical dosages, and feeding rate can influence overall system performance, their impact would be secondary to the need for a functional sludge collection mechanism in the primary clarifier.